/* Symbol, variable and name lookup.
   Copyright (C) 2019-2020 Free Software Foundation, Inc.

   This file is part of libctf.

   libctf is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3, or (at your option) any later
   version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not see
   <http://www.gnu.org/licenses/>.  */

#include <ctf-impl.h>
#include <elf.h>
#include <string.h>

/* Compare the given input string and length against a table of known C storage
   qualifier keywords.  We just ignore these in ctf_lookup_by_name, below.  To
   do this quickly, we use a pre-computed Perfect Hash Function similar to the
   technique originally described in the classic paper:

   R.J. Cichelli, "Minimal Perfect Hash Functions Made Simple",
   Communications of the ACM, Volume 23, Issue 1, January 1980, pp. 17-19.

   For an input string S of length N, we use hash H = S[N - 1] + N - 105, which
   for the current set of qualifiers yields a unique H in the range [0 .. 20].
   The hash can be modified when the keyword set changes as necessary.  We also
   store the length of each keyword and check it prior to the final strcmp().

   TODO: just use gperf.  */
